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Combination Vehicles Practice Test 1

Last updated on May 5, 2023

This Combination Vehicles Practice Test 1 contains knowledge and safe driving information that all commercial drivers should know to successfully pass the CDL “Combination Vehicles” written test.

CDL Combination Vehicles Practice Test 1 Methods:

Number of practice test questions with answers: 20

Number of correctly answered practice test questions needed to pass: 16

Passing score: 80%

Combination Vehicles Practice Test #2

This CDL Combination Vehicles Practice Test #1 with Answers is applicable for all 50 States.

CDL Combination Vehicles Practice Test (#1) With Answers



#1. To prevent rollovers, remember to:

#2. You should crank the landing gear up until:

#3. Large combination vehicles take longer to stop:

#4. Which one of the following is controlled by the foot brake?

#5. The best way to notice a trailer skid is:

#6. After coupling, how much space should be between the upper and lower fifth wheel?

#7. The service brake air line is controlled by:

#8. Which one of the following statements about tractor protection valves is NOT true?

#9. When coupling the trailer, back up slowly until:

#10. The trailer air supply control on the instrument panel:

#11. In order to supply air to the trailer, you must first:

#12. A king pin is:

#13. When traveling under 40 mph, you should follow other vehicles:

#14. If you cross connect the service and emergency air lines, the following will result:

#15. The trailer hand brake "trolley valve" should be used:

#16. How do you know if your trailer is equipped with antilock brakes (ABS)?

#17. When you back a trailer, you should position your vehicle so you can back in a curved path to the driver’s side.

#18. A device which connects the service and emergency air lines from the truck to the trailer is called:

#19. "Off tracking" occurs when you go around a corner and:

#20. In order to inspect the coupling, you should:


Combination Vehicles Practice Test #2


The pool of questions used to produce this practice test have been independently created by CDL Digest and come directly from Code of Federal Regulations (Title 49 – Transportation) and the information provided in AAMVA’s “2005 CDL Test System (July 2010 or newer Version) Model Commercial Driver Manual”.

These are the same sources that all 50 State Driver Licensing Agencies (SDLA) are required to use by federal regulation (49 C.F.R. 383.133) to develop the pool of questions for all written tests needed for a person to obtain a commercial learner’s permit (CLP), commercial driver’s license (CDL), and/or any federally authorized endorsements.

Note: The above listed source information is static, meaning changes to the information used to create the pool of questions that your State Driver Licensing Agency (SDLA) uses for the actual written test have been extremely rare over the decades. Due to the static nature of the source information, you may see practice test questions and answers in this practice test that are very similar, if not identical to the questions and answers on the actual written test. If this occurs, it is purely coincidental. CDL Digest is not affiliated with the AAMVA or any government agency.


The source material used by CDL Digest to develop these practice test questions is very technical. Relying solely on the practice tests we have produced will not be enough to successfully pass the actual written tests. You will NEED to study in order to successfully pass these practice tests and the actual written tests.

Combination Vehicles Study Guide

Class “A” Commercial Learner’s Permit Study Guide

Class “B” Commercial Learner’s Permit Study Guide

Complete CDL Study Guide

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